※ 引述《Rudin5566 (魯丁.嗚嗚溜溜)》之銘言：
: Is there a function from (0,1) onto [0,1] ? Prove or disprove it.
f(x) = { 0 if x = 1/2
{ 1 if x = 1/3
{ 1/(n-2) if x in |N\{1,2,3}
{ x otherwise
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